Trap for petrol, oil, grease, and the like.



C. DE V. GRANT.

TRAP FOR PETROL, OIL, GREASE, AND THE LIKE.

APPLICATION men JAN.27.1914.

1 ,1 99,266. Patented Sept. 26, 1916.

E srnns ATE a tron.

TRAP FOR PETROL, OIL, GREASE, AND THE LIKE.

Specification of Letters Patent.

Patented Sept. 26, 1916.

Application filed January 27, 1914. Serial No. 814,709.

To aZZ whom it may concern Be it known that I, CHARLES on Vnen GRANT, asubject of the King of Great Britain and Ireland, residing at London,England, have invented Improvements in Traps for Petrol, Oil, Grease,and the like, of which the following is a specification.

This invention relates to grease traps and particularly to grease trapsof the kind having a float-controlled water discharge cock or valvenormally submerged in the water within the trap, the inlet side of thetrap being separated from the outlet side thereof by a partition thatextends from near the top to below the water level near the bottom ofthe trap.

The object of the invention is to provide a trap of the said kindadapted to effectively trap petrol, oil, grease and the like andsuitable for use in connection with garages, dry cleaning works, largedomestic or washing up sinks, and other concerns or devices from whichliquid is likely to be discharged containing petrol, oil, grease or thelike. By so arranging the trap that the discharged liquid must passthrough it before escaping say into a sewer or local river the saidproducts can be intercepted thereby not only effecting economy by thesaving of the petrol, oil, grease or the like but also preventing thesewer or river being contaminated as well as obviating the risk ofdangerous gases liable to explode accumulating in the sewer.

According to the present invention the inlet side of the trap isseparated from the outlet side thereof by a partition that extends rightacross the trap chamber from near the top to below the water level nearthe bottom of the trap, and by other similar partitions one at least ofwhich extends downwardly from the top of the trap to below the waterlevel and another of which extends upwardly from the bottom of the tankto above the said water level, the passages above and below thepartitions being in all cases approximately of the full width of thetrap and the discharge from the trap being either below the water leveland controlled by a float, or at or near the water level and locatedbehind a partition that de pends from the top of the tank to below thewater level.

Figure 1 of the accompanying illustrative drawings shows a verticallongitudinal section and Fig. 2 in perspective elevation apart from itssetting, one construction of my improved trap. Fig. 3 is a similar viewto Fig. 1 showing another construction of the improved trap.

Referrmg to Figs. 1 and 2 0; indicates the body of the trap, Z) thefloat controlled discharge valve and 0 the partition that separates theinlet side of the trap from the outlet side thereof. Between the plateor partition 0" that extends from nearly the top of the trap to nearlythe bottom thereof, and the float-containing discharge chamber (Z of thetrap, another or second plate or partition 7' 1s arranged that extendsfrom the top of the trap to below the normal water level of thetrap soas to prevent gases passing from the inlet side to the outlet side.There is arranged as shown, between the two plates or partitions c andf, a third plate or partition gthat extends from the bottom of the trapto above the normal water level but not to the top of the trap. Thebottom of the trap below the partitions, that is to say that portion ofthe bottom between the inlet compartment h and the outlet compartment ordischarge chamber (Z may be at a higher level than the other or sideportions so that at the outlet and inlet side two pockets or wells areformed. Arranged within the pocket or well at the inlet side is or maybe a removable basket 72 indicated in dotted lines in Fig." 1, intowhich heavy foreign matters can fall. Extending from the pocket or wellat the outlet side, which in the example under notice is of less depththan the pocket or well at the inlet side, is the water outlet branch mand above the level of the said branch the'pocket or well is closed by ahorizontal partition n V in which is formed a hole controlled by thefloat actuated discharge valve Z) which is conveniently a disk valveadapted to move vertically toward and from its seat, the float beingadj'ustably connected to a vertical stem 0 attached to the said valve.

The hinged flap 1' controlling the inlet p, or each inlet if more thanone, is made somewhat heavy and is so shaped as to deflect the liquidentering the trap so that it does not disturb the liquid already in thetrap but quietly flows into the same in a thin more or less fan-shapedstream. If desired and as illustrated a perforated plate 8 adapted tobreak up the entering liquid may be so arranged that the liquid as itenters falls thereon. Plates may be bent up and over as shown toPreferably the far edge of the prevent the liquid fiowing' directly overthe edge of the plate.

In order to make a gas tight joint between the cover to and the upperedge of the plate or partition f and the top of the sides and ends ofthe trap, packing strips 2? are gripped between the said parts and thecover to.

For convenience in drawing off the oil, petrol, grease or the like fromthe inlet chamber h of the trap such chamber is or may be fitted with anappropriate cock as fixed thereto in a suitable position.

If necessary the trap may be fitted at its upper part with a reliefvalve 2.

In the modified construction shown in Fig. 3 the two pockets or wells inwhich silt or foreign matter can collect at the bottoms of the inlet andoutlet compartments or chambers h and (Z are of the same depth as eachother, and the discharge branch m which in this case is not controlledby a valve, is located near the top of the trap behind a partition 3that extends from the top of the trap to well below the water levelthereof.

I Both the traps illustrated are shown as arranged on a concrete base 2in a brickwork chamber 3.

The improved trap may be of convenient size and be made of any suitablematerial, either metal or earthenware or the like or even built up ofbrickwork or ferro-concrete if of large size, according to the purposefor which it is to be employed.

My invention does not consist in merely providing an oil or grease trapwith a number of upwardly and downwardly extending partitionsthatseparate the inlet side of the trap from the outlet side thereof forsuch traps have already been proposed.

vVhat I claim is In a trap for petrol, oil, grease and the like, achamber formed with an inlet opening at one side near the top thereofand to deflect liquid downwardly into said cham-V her, a perforatedbaffle plate upwardly and forwardly curved along one edge arrangedwithin said chamber slightly below the inlet opening thereof adapted toreceive liquid rushing through, said inlet opening and to prevent itagitating the bulk of liquid with in said chamber, an imperforatepartition within said chamber said partition having.

an upwardly turned lower edge located be low the normal liquid levelwithin said chamber and the upperv edge of said partition being locatedslightly below said cover thereby forming a passage over the partitionthrough which gas can pass to and from the compartments of said chamberformed by said partition, a second imperforatepartition located betweenthe said first mentioned partition and the outlet side of said chamberand depending from the top of said chamber to well below the normalliquid level. within said chamber, means for mak-. ing a gas tight jointbetween the top of said second imperforatepartition and said cover,

and a third imperforate partition located between the two beforementioned said imperforate partitions and extending from the bottom ofsaid chamber to above the normal liquid level within said chamber, allsaid partitions extending right across said chamber between the inletand the outlet'sides thereof. l

Signed at lONew Court, Lincolns Inn,

London, England, this seventeenth dayof January, 1914. CHARLES DEVEREGRANT."

Witnesses: V

W. HENRY SIMMs,

E. J. Gross.

Copies 01 this patent may be obtained as five cents each, byaddrcssingthe Commissioner 0: Patents, Washington, D. G.

